Use the following Canva template link to crop your photo to a circle shape. Make sure to download it as a PNG file with transparency.
https://www.canva.com/design/DAFwajOoCXM/LrvLzmk2abEW9ib9prwuiw/view?utm_content=DAFwajOoCXM&utm_campaign=designshare&utm_medium=link&utm_source=publishsharelink&mode=preview
If you do not want speaker information on your card, use this template instead:
https://print-cru.techsound.com/templates/recruiting-simple